To Next Page

To Previous Page

glEdgeFlagPointer

Chapter 5

129

glEdgeFlagPointer

glEdgeFlagPointer: deﬁne an array of edge ﬂags.

C Speciﬁcation

void glEdgeFlagPointer(

GLsizei stride

const GLvoid *pointer)

Parameters

stride Speciﬁes the byte offset between consecutive edge ﬂags. If stride is 0

(the initial value), the edge ﬂags are understood to be tightly packed in

the array.

pointer Speciﬁes a pointer to the ﬁrst edge ﬂag in the array.

Description

glEdgeFlagPointer speciﬁes the location and data format of an array of boolean edge

ﬂags to use when rendering. stride speciﬁes the byte stride from one edge ﬂag to the next

allowing vertexes and attributes to be packed into a single array or stored in separate

arrays. (Single-array storage may be more efﬁcient on some implementations; see

glInterleavedArrays.)

When an edge ﬂag array is speciﬁed, stride and pointer are saved as client-side state.

To enable and disable the edge ﬂag array, call glEnableClientState and

glDisableClientState with the argument GL_EDGE_FLAG_ARRAY. If enabled, the edge

ﬂag array is used when glDrawArrays, glDrawElements, or glArrayElement is called.

Use glDrawArrays to construct a sequence of primitives (all of the same type) from

pre-speciﬁed vertex and vertex attribute arrays. Use glArrayElement to specify

primitives by indexing vertexes and vertex attributes and glDrawElements to construct

a sequence of primitives by indexing vertexes and vertex attributes.

Notes

glEdgeFlagPointer is available only if the GL version is 1.1 or greater.

The edge ﬂag array is initially disabled and it won’t be accessed when glArrayElement,

glDrawElements or glDrawArrays is called.

Execution of glEdgeFlagPointer is not allowed between the execution of glBegin and the

corresponding execution of glEnd, but an error may or may not be generated. If no error

is generated, the operation is undeﬁned.

glEdgeFlagPointer is typically implemented on the client side.

Edge ﬂag array parameters are client-side state and are therefore not saved or restored

by glPushAttrib and glPopAttrib. Use glPushClientAttrib and glPopClientAttribinstead.

HP b2600 Reference Guide

Other manuals for HP b2600